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Gas bag finished with a flame retardant

a technology of flame retardant and gas bag, which is applied in the direction of pedestrian/occupant safety arrangement, thin material handling, vehicle safety arrangment, etc., can solve the problems of increased layer thickness and also a greater mass of gas bag fabric, and the use of special high-temperature resistant plastics is not justifiable economically, so as to achieve the effect of increasing heat resistan

Inactive Publication Date: 2008-05-15
TRW AUTOMOTIVE SAFETY SYST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention provides a gas bag for a vehicle occupant restraint system that includes a fabric made of a flame retardant material that contains an intumescent material. The intumescent material expands upon exposure to heat, forming a protective layer that prevents the fabric from catching fire. The intumescent material can be incorporated into the fabric or applied as a coating, and the fabric can be further coated with a silicone-based coating for improved heat resistance. Compared to conventional fabrics, the intumescent material-treated fabric exhibits increased heat resistance and does not compromise the folding strength of the gas bag.

Problems solved by technology

The use of sacrificial materials, however, results in a greater layer thickness and also a greater mass of the gas bag fabric.
The use of special high-temperature resistant plastics is not justifiable economically.

Method used

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  • Gas bag finished with a flame retardant
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Embodiment Construction

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[0021] The gas bag 10, shown in FIG. 1 in the inflated condition, of a vehicle occupant restraint system is connected by its orifice 12 to the housing 14 of a gas generator 16. The gas bag 10 shown here consists of a middle wall part 18 and two lateral wall parts 20, 22, which are each constituted by a fabric. Other cuts may be used as well.

[0022] The wall parts 18, 20, 22 each have two opposite surfaces, one on the outside of the gas bag and one on the inside of the gas bag, which faces the gas volume flowing out from the gas generator 16 and into the gas bag 10. For a simplified representation, only the surface 26 of the wall part 18 facing the inflowing gas volume is shown in FIG. 1. In the embodiment shown here, the surface 26 on the inside of the gas bag is finished with a coating 28 to increase the heat resistance. The coating 28 is preferably a silicone rubber which contains the intumescent material in a proportion of approximately 10 percent by weight. The intumescent mate...

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Abstract

A gas bag for a vehicle occupant restraint system comprises at least one wall part made of a fabric that is finished with a flame retardant, wherein the flame retardant contains an intumescent material.

Description

[0001] The present invention relates to a gas bag for a vehicle occupant restraint system, including at least one wall part made of a fabric that is finished with a flame retardant. BACKGROUND OF THE INVENTION [0002] Gas bags or airbags for vehicle occupant restraint systems usually consist of silicone-coated or uncoated polyamide or polyester fabrics. The fabrics are required to allow a specific adjustment of the permeability to air and, in addition, must be heat-resistant. Furthermore, in the interest of requiring as little space as possible for accommodating the gas bag in the vehicle, the fabrics are to exhibit good foldability and a mass that is as low as possible. [0003] It has already been proposed to provide the inside of the gas bags with heat-absorbing means such as for example a film coating or other sacrificial materials. These sacrificial materials are fused or disintegrated by the hot gases flowing into the gas bag and are intended to protect the actual gas bag wall ag...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): B60R21/16
CPCB60R21/235Y10T428/1362B60R2021/23514
Inventor SCHATZMULLER-BARAGAS, MONICA
Owner TRW AUTOMOTIVE SAFETY SYST
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